* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.loading {
  width: 20px;
  height: 20px;
  border: 2px solid red;
  animation: loading 0.3s infinite linear;
}

@keyframes loading {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}